Domestic cooker.



J. LAWRENCE.

DOMESTIC GOOKER.

APPLICATION FILED 1150.16, 1909.

1 ,069,440. Patented Aug. 5, 1913.

wwvwiww TAMS EAWRNC, YGRK, hl'. Y., ASSGN @1% T0 ELECTRIC HEAT STORAGE QMINI, A GZbOEEtPORAEHON OE NEW YORK.

noninsrle cooirnn.

accenna..

Specicatien ofetters Patent.

rateateaagaieia application inea necemter ic, reca. serial no. 532,412.

To all wom t may concern:

Be it known that l, JAMES LAWRENCE, 'a subject of the King of Great Britain, residing at New York city, county and State of New York, United States of' America', have invented certain new and useful lmroveinents in DomesticCookers;l and ll do 'ereby declare the following to be a full, clear, 'and eXact description ot the invention, such as will enable others skilled in the art to which it appertains to make and use the' same, reference being had tothe accompanying drawings, and to letters or iig'ures of reference markedlthereon, which form a part of this specification.

My invention relates to cookers for domestic use and has for itsobject to provide a simple and eiiicient means for cooking food that is heated by electricity and capable of accumulating heat and utilizing vsuc-h 'accumulated heat for cooking purposes after.

the electric current has been cut od, together with details oi' construction herein- 'after described and claimed.

Referring to the drawings in which like parts are similarly designated9`h`igure 1 is a vertical longitudinal section of the cooker showing parts in elevation. Fig. 2 is a horizontal section thereof.

The cooker comprises a frame 2 on which is supported an insulating casing 3 surrounding'. an inverted boa-like water tank i. rThis tank has a water inlet 5 from a service main or other water supply and an outlet cock 6 outside` the cooker secured on the end of a draw-ott pipe 7 extending tothe interior and near the top of the water tank. The water tank is lined as Ishown at 8 with insulating material and within the lining is a heat accumulato-r 9 comprising a substantially rectangular inverted bon-like block of iron having inserted therein electric heaters 10.` lron is preferably used since, as is well known, it possesses the property of high specific heat, as compared with most of the metals. It also has good heat conductivity, as compared with substances like soapstone, for example, which has heretofore been used to store heat. This block of iron is closed at the tcp and open at the bottom and is provide with a nre-brick or other insulating lining 11 on its interior.

The bottom of the accumulator and cooker is closed by an insulating plate 12 supported on a vertically movable frame 13 guided by pinions 14 engaging a rack 15 on Vthe frame 2. The frame 13 is connected at each side to one or more ropes, chains or the like 16 passing over ulleys 17 and counterbalanced by a weig t Q18. On the insulating plate 12 is a block 19, preferably of insulating material on which the cooking utenthe maximum load is not on the electric circuit and when the maximum load is on the electricmains, may he cut out, either automatically or otherwise, by any well known type of cut out. The consequences will be that the heat will be stored in the insulated accumulator 9 so that it will be ready for cooking at any time and it will simply be necessary to pull down o-n the handles 21, lower the counterbalanced bottom 12 and place the cooking utensils on the block 19. The opening of the cooker by pulling down the door or plate 12 does not materially cool the cooking chamber contained therein for the reason that this chamber entraps the heated air that has a tendency to rise. Any heat that escapes through Athe insulation 8 will be utilized in the heating water in the tank 4.

claim:

1. An electric cooker, comprising an inclosed air `cooking-chamber capable of receiving articles to be cooked,said chamber having a surrounding mass of metal ot large heat storage capacity capable of storing heat 'and imparting the stored heat to heat the air chamber for cooking purposes and an electric heater for appl ing electric energy to said mass t'o be store therein for subse uent use.-

2. n electric cooker comprising 'closed air"cookingchamber capab e an inof receiving articles to be cooked, a hea-t accumulator varound the chamber consisting of amass of metal of large heat storage capacity capable of storing heat and imparting the stored heat to heat the air chamber for cooking purposes and an electric heater of small capacity for heating said mass.

3. An electric cooker comprising an inclosed air cooking-chamber capable of receiving articles to be cooked, a heat accumulator consisting of a mass of metal of large heat storing capacity capable of storing heat and imparting the stored heat to heat the air chamber for cooking purposes, and an electric heater` for heating said mass.

4. An electric cooker comprising a heat accumulator of large heat storage capacity capable of storing heat and having an air inclosed cooking-chamber therein for the articles to be cooked, and means to electrically heat-said accumulator to supply the heat to be stored therein, whereby the cooking operation is independent of the time of application of the electric energy.

5. An electric cooker comprising a mass of metal adapted to store heat and havin@ an air-cooking chamber therein open at thelbottom adapted to receive its heat from said storage mass, means to electrically heat the mass, and means to close the bottom.

6. An electric cooker comprising a heat accumulator capable of storing heat and having anl air cooking-chamber formed therein open at the bottom adapted to receive its heat from said heat accumulator, electric heating means to supply heat to the accumulator and a closure for said chamber movable to and from the bottom.

7 A cooker comprising a stationary heat accumulator having a cooking chamber therein, an external and internalinsulating coating for the accumulator, electrical heating units arranged within the accumulator to heat the same and a vertically movable door on which the cooking utensils are v adapted to be supported.

8. A cooker comprising a stationary heat accumulator having a cooking chamber therein closed at its top and open at its bottom, an external andan internal insulating coating for the accumulator,awater chamber surrounding the externalcoating, an insulating coating for the water chamber, a vertically movable counterbalanced door for the cooking chamber on which the cooking utensils are .adapted to be supported, and electrical means to supply the heat to be stored in said accumulator.

9. An electric cooker, comprising a stationary heat accumulatorcapable of storing a large quantity of heat and having an internal cooking chamber open at the bottom adapted to receive its heat from said heat accumulator, a vertically movable Counterbalanced closure for the bottom of said chamber, and electrical heating devices in the accumulator to supply heat thereto.

10. The combination of a heat storage mass of high specific heat and good heat conductivity, means associated therewith for heating it, and a cooking chamber adapted to be heated by said storage mass. f

11. A cooker containing a cooking chamber and a heat storage mass of high speciiic heat and good-heat conductivity surrounding the chamber and adapted to heat it, and means to heat the said mass.

v 12. A cooker containing a cooln'ng chamber and a heat storage mass of high specic heattand good heat conductivity surrounding the chamber and adapted-to heat it, and electric means for heating the said mass.

13. flthe combination of a cooker containing an inclosed cooking chamber, a heat storage mass of high specic heat and good heat conductivity surrounding the chamber and forming part of its inclosing walls and adapted to receive and store heat and to impart it to the cooking-chamber toheat the latter for cooking purposes, and a removable door also forming part or the inclosing walls and adapted to be removed and replaced to permit the insertion and removal of articles into and from the cooking chamber.

14. rllhe combination of a heat storage mass, means for heatin it, and a cooking chamber adapted to be heated by said storage mass and lined with a heat refractory material form-ing part of the heat storage mass.

15. A cooker containing a cooking chamber lined with a heat refractory material and having a heat Stora e mass surrounding the chamber and its lining and adapted to heat them, and electric means for heating the said mass.

16. An electric cooking apparatus consisting of a heat-insulated heat accumulator of .a mass having high specificv heat and good heat conductivity, capable of storing a large amount of heat and of` parting with it rapidly, a cooking chamberconnected with and adapted to be heated by the heat accumulator, and electric means to heat the heat accumulator at a slower rate than the heat consumption during cooking operations.

17. An electric cooking apparatus 4comprising a heat-insulated heat accumulator made of a inass having high specific heat and good heat conductivity and capable of storing a large amount of heat and of quickly parting with its heat, an electric heating element for heating the heat accumulator, and a cooking chamber adapted to be heated b said heat accumulator.

18. An e ectric cooking apparatus com-A prising a heat-insulated heat accumulator made of a solid mass having high speciiic heat andgood heat conductivity and capable of storing a large amount of heat and of my invention, l have signed my name in quickly parting with its heat, an electric presence of two subscribing Witnesses. heating element for heat-ing theheat accu- JAMES LAWRENCE mulawr, and a cooking, chambex inclosed by 5 said heat accumulator and adapted to be Witnesses:

heated-by it. G. J. LILLIAN NICHOLSON,

ln testimony that l claim the foregoing as LAURA E. SMITH. 

